Best Cannabis Seeds To Grow Indoors

Cannabis Seeds for Indoor Marijuana Growing. Best seeds for growing weed indoors. Check out these marijuana seeds for growing cannabis indoors. Weed seeds. Read here to find eight of the best high-THC strains for indoor growers this year and shop high-quality seeds from I Love Growing Marijuana

20 Great Cannabis Seeds for Indoor Marijuana Growing

Check out our handy guide on how to grow marijuana indoors and 20 great cannabis seeds for indoor marijuana growing. Growing marijuana indoors involves strong lights, fans, irrigation systems, and other cultivation equipment needed to provide marijuana plants with the right light, water, and nutrients to grow to their fullest potential.

What Is Indoor Marijuana Growing?

Indoor marijuana growing doesn’t just mean putting a marijuana plant next to the windowsill and hoping for the best. Indoor growing requires growers to mimic outdoor environmental factors such as sunlight, rain, and soil conditions. Indoor growers can equip themselves with lights strong enough to give energy to plants and the right soil conditions for optimal nutrient intake.

Indoor cultivation gives growers ultimate control over all of the elements that affect a cannabis seed’s yield, flower density, trichome production, and overall quality. Indoor growers aren’t beholden to the natural climate or season. Furthermore, cannabis crops are safeguarded against harsh environmental conditions such as wind, rain, and snow and predators.

Factors to Consider When Choosing Indoor Cannabis Seeds

When growing marijuana indoors, you’ll need to consider the most basic elements of a grow set-up starting with which cannabis seeds to buy for an indoor grow. The type of cannabis seeds you choose depends on your cultivation experience, budget, strain preference (sativa, indica, hybrid), and size of your growing space.

Here, you’ll find a list of 20 great cannabis seeds for indoor growing along with the strain’s ideal growing conditions.

Autoflowering Cannabis Seeds For Growing Indoors

Some growers may even use autoflowering seeds, which don’t require a photoperiod to flower like most marijuana seeds. Photoperiod marijuana seeds need a certain amount of light and darkness per day, usually a 12/12 cycle to transition from their vegetative to the flowering strains. For light-deprived locations, autoflowering strains will automatically flower at a set period.

1. Sensi Skunk Automatic

Sensi Skunk is a great cannabis seed for beginners and budget growers. Sensi Skunk Automatic allows beginners to take a low-maintenance approach to grow. This autoflowering seed features many of the same Skunk characteristics that have made its parent a favorite among growers and critics.

Sensi Skunk Automatic is bred from a curated ruderalis strain that enables the strain to begin to flower without a photoperiod. Sensi Skunk should autoflower after about five weeks. The seed grows short and stocky plants with big buds. Harvesting can occur about 50 days later. Experience a citrusy and sweet aroma with uplifting and stress-relieving effects.

2. Super Skunk Automatic

Super Skunk Automatic is ideal for medicinal users who want to plant as much medicine throughout the year as possible. Super Skunk Automatic provides users with strong indica effects without leaving you glued to the couch. Novice growers will appreciate how easy this strain is to grow and the relief it can bring for stress and pain.

For growers who can’t or don’t have the energy to maintain a finicky plant, the Super Skunk automatically begins to bloom after about four weeks regardless of changes in photoperiod. This automatic strain can be grown in a variety of areas such as windowsills. Super Skunk’s flowering period takes about 65 days and produces an average yield.

3. Northern Lights Automatic

Northern Lights Automatic is a great cannabis seed for growers with some experience who want to push their skills to the next level. Northern Lights Automatic is worth the effect due to its robust effects. This autoflowering strain is relatively easy to grow and produces award-winning effects and aromas.

Northern Lights Automatic grows short and just over three feet. Its flowering period is about 55 days and its seeds begin to flower after about a month or sooner. Northern Lights Automatic can produce harvests with dense and trichome-rich buds up to three times a year due to its autoflowering characteristics and flowering periods.

4. Gorilla Glue Automatic

Gorilla Glue Automatic has won multiple industry awards for its extreme trichome production that can leave trimming shears glued stuck. Gorilla Glue Automatic can reach a medium height with a dense bud structure. This autoflowering strain is easy to grow for beginners and produces a sweet and pungent aroma.

Gorilla Glue Automatic’s grow time is between 50 and 60 days and produces a plant reaching almost 40 inches. Gorilla Glue exhibits relaxing and euphoric effects, perfect for medical conditions such as pain, arthritis, stress, nausea, and epilepsy. Be careful, Gorilla Glue has a very high THC content.

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5. Girl Scout Cookies Automatic

Girl Scout Cookies Automatic combines classic GSC and ruderalis genetics to produce a high-quality autoflowering strain. This indica-dominant autoflowering strain grows into medium-size plants that respond well to training. Expect trichome-rich and sweet-smelling buds that produce cerebral and physical effects.

GSC Automatic’s grow time is between 60 and 70 days from seed. Plants can reach up to 35 inches in height and produce up to seven ounces per plant. GSC Auto is easy to grow, but can produce an extremely pungent aroma. Carbon filtering can help keep your indoor grow more discreet.

6. Green Crack Automatic

Green Crack Automatic is an autoflowering marijuana strain that blends the iconic Green Crack genetics with a ruderalis. The resulting Green Crack Automatic strain grows short and stout with extremely white buds and a delightful citrus and mango aroma. Green Crack Automatic delivers users energizing effects.

Green Crack Automatic’s grow time is about 63 days from seed and can grow up to 35 inches tall. Green Crack Auto is an easy-to-grow strain that produces moderate-to-high yields indoors and outdoors. After eight to nine weeks, these autoflowering seeds can deliver the right dose of medicinal relief to lift your spirits.

Feminized Cannabis Seeds For Growing Indoors

Feminized cannabis seeds for growing indoors will only produce female cannabis plants, albeit, they require a photoperiod to begin flowering, unlike autoflowering strains. Feminized plants eliminate the possibility of growing a male plant that can pollinate your entire grow. Many feminized seeds can thrive in indoor conditions.

7. Big Bud

Big Bud is an excellent feminized cannabis seed to grow indoors due to its very high yields and dense buds. Big Bud was popularized in the 1980s and continues to be one of the hardest-working seeds out there. This indica-dominant variety has a hash-like flavor and aroma and slightly sedative effects.

Bud Bud has a flowering time between 50 and 65 days. This feminized seed can grow to an average height and have a growth spurt during bloom. Bid Bud prefers warm weather and can thrive indoors under a hydroponic setup. Its thick stalks help support its heavy bud production. Sea of Green (SOG) techniques can be used for speedy growth.

8. Silver Haze #9

Silver Haze #9 is a sativa-dominant strain from Sensi Seeds that can be grown indoors. Silver Haze is commonly available as a feminized seed. This classic and award-winning haze strain produces a cerebral high and a complex bouquet of scents including citrus, berries, mint, and other sweet fruit.

Silver Haze #9 has a flowering time of about 70 days. Silver Haze #9 can grow well under lights. It can grow tall with heavy resin production and long buds. Silver Haze #9’s strong growth allows growers to grow these plants in close proximity. Silver Haze #9 also responds well to bending and training.

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9. Amnesia Haze

Amnesia Haze takes traditional Dutch genetics and elevates them to produce a euphoric and cerebral head high like other haze varieties. Amnesia Haze thrives in indoor growing conditions, but has a relatively long flowering time. The wait is worth it. Amnesia Haze can produce a high yield under optimal cultivation conditions.

Amnesia Haze prefers consistent warm temperatures and has a ten-to-eleven-week flowering time. Growers are advised to keep indoor temperatures between 70 and 80ºF. Amnesia Haze plants must be well-ventilated to prevent mold and pest problems. This feminized seed produces a citrusy and sweet-smelling strain with powerful effects.

10. White Widow

White Widow is an excellent cannabis seed to grow indoors. With roots in the Netherlands, White Widow was developed from a pure Brazilian sativa and an indica hybrid. White Widow’s seeds are easily available and are great entry-level seeds for beginner growers. White Widow can withstand cooler climates.

White Widow produces a pine-scented cannabis strain and has a flowering time of eight to nine weeks. White Widow grows into a stocky, but high-yielding plant with resin-covered buds. Growers recommend using the SCROG technique with White Widow. White Widow can grow in soil or hydroponic setup.

11. Power Plant

Power Plant, from the Dutch Passion Seed Company, originated from South African sativa seeds. Due to its hardy genetics, Power Plant grows fast compared to most sativas and grows medium-sized flowers with popcorn buds, too. It has a woody and earthy aroma that can give you a calm and clear-headed high.

Power Plant’s flowering time is between seven and nine weeks. Power Plant seeds can grow well under SCROG methods. This plant can grow tall so consider your grow size. You can prune the plant to keep it growing nice and strong and save the trim for other cannabis infusions.

12. Critical

Critical is an overall excellent marijuana seed to grow indoors or outdoors. Critical seeds produce a high yield, are easy to maintain, and create a heavy coat of resin over its dense marijuana buds. Critical allows users to feel more relaxed and blissful.

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Critical has a flowering time of about seven weeks. Its relatively speedy flowering time makes it a great strain for those who want to grow as fast as possible. Critical produces a plentiful crop with its tall plants, long leaves, and rich resin production.

Regular Cannabis Seeds For Growing Indoors

Regular cannabis strains can produce either a male or a female plant. There are many regular cannabis strains that can grow indoors. Below, you’ll find a list of the best cannabis seeds for indoor growing.

13. Jack Herer

Jack Herer is a great cannabis seed for indoor growing. Whether you’re a first-time or long-time grower, Jack Herer is an easy-to-grow sativa strain that delivers clear-headed euphoria and eases muscle tension. Enjoy its earthy, lemony, and peppery aroma mixed with woody and fruity flavors.

Jack Herer’s flowering time is about 65 days and can grow very tall. Jack Herer grows exceptionally in hydroponic systems. It grows bushy, so make sure there is enough space between your marijuana plants. Also, make sure you have enough height to support its growth and watch out for heavy branches that can snap.

14. Chemdawg

Chemdawg has been a popular cannabis seed since the 1990s. Chemdawg is the parent strain to many of today’s best-selling strains including Headband, Sour Diesel, and OG Kush. This indica-dominant strain is easy to grow and can handle stressors well. Chemdawg produces dense buds packed with trichomes and a fruity and diesel aroma.

Chemdawg’s flowering time is about 63 days, a relatively quick grower compared to other cannabis strains. Chemdawg does well when trained in a SCROG environment to increase the yields in a small space. SCROG requires growers to prune the foliage from the base to improve airflow. Chemdawg is vulnerable to mold.

15. White Russian

White Russian seeds by Serious Seeds is an indica-dominant hybrid with AK-47 and White Widow genetics. White Russian seeds produce a high bud-to-leaf ratio with compact and trichome-heavy colas. White Russian strains deliver a long-lasting and cerebral buzz along with a deep sense of relaxation.

White Russian seeds grow into medium-height plants and produce a very pungent smell. It has a flowering time between eight and nine weeks. White Russian doesn’t require as much maintenance as other cannabis seeds and can flourish in a warm environment.

16. Maple Leaf

Maple Leaf cannabis seeds by Sensi Seeds is a legendary Aghani strain that was smuggled out of the country around the late 1970s. This pure indica is fast flowering and develops compact plants, large leaves, and dense buds that have an excess of resin. Enjoy its citrus aroma and taste, as well as its sedating effects.

Maple Leaf’s flowering time is between six and seven weeks. Maple Leaf plants resemble sativa plants with its tall-growing characteristics and dense and elongated buds. Try your hand at growing Maple Leaf in soil or hydroponic setups. SCROG methods work well with this strain, too.

17. Hindu Kush

Hindu Kush is a pure indica strain that came out of the Hindu Kush mountains in Central Asia. Since the 1980s, Hindu Kush has been a stable strain that produces medium-height plants and dense buds. Hindu Kush strains exhibit a woody smell along with notes of hash and a calming body high.

Hindu Kush has a flowering time between six and seven weeks. Hindu Kush grows short and bushy with dense flower buds. With a hydroponic set-up, Hindu Kush can produce large buds with tons of resin. Use a SOG (sea of green) technique to maximize your yields. Just make sure you keep the airflow optimal to avoid mold.

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The best high-THC strains indoor growers need this year

Seasoned grower or growing novice, we can all agree that one of the best parts about growing weed indoors is having the ability to control our crop’s environment. When we properly regulate factors like light, climate, and air circulation, it’s almost a guarantee that our harvests will yield some pretty amazing weed. But what makes the difference between pretty amazing weed and top-tier weed? It all starts with the right strain.

Large-scale cannabis grower and breeder Robert Bergman learned the importance of choosing the right strain when he started growing cannabis at home 25 years ago. What started as just five little plants grew into I Love Growing Marijuana (ILGM), a business that helps cannabis connoisseurs become successful cannabis growers. With more than 200 grow guides on every stage of cannabis production, community-driven grow journals, and in-depth profiles on the best cannabis strains, ILGM is an amazing resource for all levels of growers.

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Among some of the best strains for indoor growers are those with high levels of THC. Cultivating high-THC strains is perfect for those seeking high-potency rewards, and the unique conditions of indoor growing allow these hard-hitting strains to be even further optimized. Below are eight of the best high-THC strains for indoor growers this year, so take a peek and see what’s right for you.

When you’re ready to get growing, visit the internationally available ILGM shop for seeds and everything else you’ll need.

Gorilla Glue

Known for having super high THC levels up to 26%, Gorilla Glue is a popular hybrid strain that delivers deeply euphoric and relaxed vibes. Born from parent strains Chem’s Sister, Sour Dubb, and Chocolate Diesel, Gorilla Glue has a notably rich and earthy aroma, and its flavor profile makes it a popular edibles strain. With a hearty constitution and high resistance to disease, this strain is fairly easy to grow—making it a great option for beginners.

Available from ILGM both feminized and autoflower.

Zkittlez

Just as sweet and colorful as its name suggests, Zkittlez is an indica-dominant strain that produces a complex, fruity aroma and beautiful buds in green, purple, and orange. A mix of Grape Ape and Grapefruit, this strain boasts THC levels up to 23% and relaxed and uplifted effects that result in a perfectly balanced, mellow high. Generally compact and bushy and fairly resistant to mold and mildew, Zkittlez is a great strain for indoor growing beginners. More advanced growers can easily train their Zkittlez plant to optimize its yield.

Available from ILGM both feminized and autoflower.

GSC Extreme

GSC Extreme is a super-powered, indica-dominant variation on standard GSC. A hybrid of parent strains Durban Poison and OG Kush, this strain features high-THC levels up to 21% and promotes feelings of relaxation, happiness, and creativity. The plant’s aroma recalls notes of chocolate, mint, and a touch of spice, while its flavor is both sweet and complex. This strain is relatively easy to grow, but indoor growers should keep space in mind, as these plants love to grow both up and out.

Available from ILGM both feminized and autoflower.

Bruce Banner

Bruce Banner is known to pack a punch. With extreme THC levels up to 25% and an intense rush of euphoria and energetic joy, this green monster produces a happy “Hulk effect.” A blend of OG Kush and Strawberry Diesel, Bruce Banner’s smell and flavor profile is undeniable, with a unique combination of fruit and diesel. Bruce Banner is also a hearty plant that produces highly potent, huge yields.

Available from ILGM both feminized and autoflower.

Gold Leaf

Cultivated by ILGM’s founder Robert Bergman, Gold Leaf is an indica-forward strain that delivers immediate feelings of happiness, euphoria, and creativity. This strain boasts THC levels up to 21% and has a uniquely pungent, earthy aroma and flavor. Bergman designed Golf Leaf for all levels of growers, ensuring high yields and easy cultivation both indoors and outdoors. When growing indoors, make sure to manage the plant with proper cropping and pruning to ensure a steady growth rate and optimal results.

Available from ILGM both feminized and autoflower.

Blue Dream

Born from Blueberry and Super Silver Haze, Blue Dream is one of the most popular strains on the market, best known for its smooth, relaxing daytime high. The sativa-forward strain from California features THC levels up to 21% and a distinct blueberry scent and flavor profile with touches of vanilla and spice. The Blue Dream plant is on the taller side and its sweet scent can attract parasites, so it’s ideal for indoor growing.

Available from ILGM both feminized and autoflower.

Banana Kush

Born in the Golden State, this bright green, indica-dominant strain is known for its chill, happy vibes. With incredibly high THC levels up to 27% and a stimulating buzz, Banana Kush is a favorite among creatives and social butterflies alike. Sweet as a banana, Banana Kush promotes feelings of happiness, euphoria, and relaxation. Growing Banana Kush is best for more experienced growers, as it requires constant air flow, pruning, and (ideally) an indoor hydroponic setup.

Available from ILGM both feminized and autoflower.

Autoflower Super Mix

Gorilla Glue Auto, Bruce Banner Auto, GSC Extreme Auto

Looking for the all-star roundup? The Autoflower Super Mix features a collection of these top-performing strains for indoor growers in autoflowering varieties—Gorilla Glue, Bruce Banner, and GSC Extreme—so you can collect these top high-THC highlights all in one pack.

Available from ILGM as a mixpack.

Be sure to check out your local laws and regulations on cannabis homegrowing before you start your adventures in cultivation.